A lithium ion battery negative electrode material p+tio 2 The preparation method of +cnt
A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of increasing the contact area between active materials and electrolytes, increasing the confinement effect of red phosphorus, and the flammability of white phosphorus, etc., to achieve improved The effect of specific capacity and cycle charge-discharge stability, environmental friendliness, and simple preparation method
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[0033] Such as Figure 1-15 Shown, a kind of lithium ion battery negative pole material P+TiO of the present invention 2 The preparation method of +CNT comprises the following steps:
[0034] a. The commercial red phosphorus powder is ball-milled in deionized water, and after the cells are pulverized, the hydrothermal treatment is carried out under high temperature conditions, and the red phosphorus P is obtained by centrifugal drying after being taken out;
[0035] b. Disperse tetrabutyl titanate in ethanol and stir well with a glass rod. Disperse the above purified red phosphorus P in ethanol, add ammonia water after crushing the cells, and heat to 40-50°C, add tetrabutyl titanate dispersion solution drop by drop while stirring, then magnetically stir, and then use after suction filtration Washing with ethanol and drying to obtain red phosphorus / titanium dioxide or P+TiO 2 composite materials;
[0036] c. The carbon nanotube CNT and the above P+TiO 2 The composite mater...
Embodiment 1
[0043] (1) Disperse 2g of tetrabutyl titanate in 10mL of ethanol and stir well with a glass rod. Disperse 84mg of purified red phosphorus in 30mL of ethanol, add 1mL of ammonia water after crushing the cells for 30min, and heat to 45°C, add tetrabutyl titanate dispersion dropwise while stirring, then magnetically stir for 10h, and then Wash with ethanol and dry to get P+TiO 2 composite material.
[0044] (2) 20mg of carbon nanotubes and 80mg of the above P+TiO 2 The composite was crushed in a solvent for 30 min, centrifuged, washed and frozen at -80 °C, and then transferred to a lyophilizer to obtain P+TiO 2 +CNT composites.
[0045] pass figure 1 Confirmation of prepared P+TiO 2 +CNT composites contain carbon nanotubes and amorphous red phosphorus and titanium dioxide.
[0046] Figure 2-7 It is known that the P+TiO prepared by the present invention 2 For the sheet amorphous structure. In this structure, titanium dioxide is evenly distributed on the red phosphorus sh...
Embodiment 2
[0050] (1) Disperse 10 g of tetrabutyl titanate in 10 mL of ethanol, and stir well with a glass rod. Disperse 84mg of purified red phosphorus in 30mL of ethanol, add 20mL of ammonia water after crushing the cells for 30min, and heat to 45°C, add tetrabutyl titanate dispersion dropwise while stirring, then magnetically stir for 10h, and then Wash with ethanol and dry to get P+TiO 2 composite material.
[0051] (2) 100mg of carbon nanotubes and 20mg of the above P+TiO 2 The composite was crushed in a solvent for 30 min, centrifuged, washed and frozen at -80 °C, and then transferred to a lyophilizer to obtain P+TiO 2 +CNT composites.
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